I just completed a quilt using 2 1/2 inch strips and the Easy Angle Ruler. It turned out great! The pattern was called Twin Stars in the book titled Jelly Roll Quilts by Pam & Nicky Lintott. The book says you need the Omnigrid 96 or 96L ruler (looks similar to the East Angle) and provides instructions and diagrams to cut the 1/2 sq triangles.
I attempted to insert a picture of my quilt, but I couldn't get it to load. Sure wish I was a little more computer literate.